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workspace problem

Newbie

workspace problem

I want to replace an assembly from local to windchill workspace, I matched name of all the parts inside the assembly.The difference between both assembly is number of change in datum points for the wire.when i opened the updated file from local workspace and clicked save i got some info saying that "i need to checkout some objects".once i proceed with that dialogbox.after sometimes i got checkout failed  message saying "i dont have access to perform that operation".Then i closed and gave erase not displayed and opened the same file in windchill that i was trying to update from local workspace.i found some erros in that file and in tables it shows a clock symbol with saying "modified by you".my question is how the parts gets modified even i dont have permission to checkout the parts in assembly.@